diff --git a/lib/mammoth/src/debug.cpp b/lib/mammoth/src/debug.cpp
index 087a823..7a5ae07 100644
--- a/lib/mammoth/src/debug.cpp
+++ b/lib/mammoth/src/debug.cpp
@@ -1,5 +1,5 @@
 #include "include/mammoth/debug.h"
 
-#include "zcall.h"
+#include <zcall.h>
 
 void dbgln(const char* str) { ZDebug(str); }
diff --git a/lib/mammoth/src/thread.cpp b/lib/mammoth/src/thread.cpp
index 2bc847f..909df3e 100644
--- a/lib/mammoth/src/thread.cpp
+++ b/lib/mammoth/src/thread.cpp
@@ -1,6 +1,6 @@
 #include "include/mammoth/thread.h"
 
-#include "zcall.h"
+#include <zcall.h>
 
 namespace {
 
diff --git a/sys/test.cpp b/sys/test.cpp
index fe1d9b7..af1f43b 100644
--- a/sys/test.cpp
+++ b/sys/test.cpp
@@ -1,6 +1,5 @@
-
-#include "zcall.h"
-#include "zerrors.h"
+#include <zcall.h>
+#include <zerrors.h>
 
 constexpr uint64_t prog2 = 0x00000020'00000000;
 
diff --git a/sys/test2.cpp b/sys/test2.cpp
index 69d735d..ba7bf52 100644
--- a/sys/test2.cpp
+++ b/sys/test2.cpp
@@ -1,5 +1,5 @@
-#include "mammoth/debug.h"
-#include "mammoth/thread.h"
+#include <mammoth/debug.h>
+#include <mammoth/thread.h>
 
 #define CHECK(expr)       \
   {                       \